1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
andrew11 [14]
3 years ago
6

At the local playground, a 21-kg child sits on the right end of a horizontal teeter-totter, 1.8 m from the pivot point. On the l

eft side of the pivot an adult pushes straight down on the teeter-totter with a force of 151 N.In which direction does the teeter-totter rotate if the adult applies the force at a distance of 3.0 m from the pivot? (clockwise/ counterclockwise)

Physics
2 answers:
Novosadov [1.4K]3 years ago
8 0

The teeter-totter rotates counterclockwise

\texttt{ }

<h3>Further explanation</h3>

<em>Let's recall </em><em>Moment of Force</em><em> as follows:</em>

\boxed {\tau = F d }

<em>where:</em>

<em>τ = moment of force ( Nm )</em>

<em>F = magnitude of force ( N )</em>

<em>d = perpendicular distance between force and pivot ( m )</em>

Let us now tackle the problem !

<u>Given:</u>

mass of child = m_c = 21 kg

distance between pivot and child = d_c = 1.8 m

magnitude of force = F = 151 N

distance between force and pivot = d = 3.0 m

<u>Asked:</u>

direction of rotation = ?

<u>Solution:</u>

<em>Firstly , we will find </em><em>clockwise moment</em><em> by weight of the child:</em>

\tau_{clockwise} = w \times d_c

\tau_{clockwise} = mg \times d_c

\tau_{clockwise} = ( 21 \times 9.8 ) \times 1.8

\boxed{\tau_{clockwise} = 370.44 \texttt{ Nm}}

\texttt{ }

<em>Next, we will find </em><em>counterclockwise moment </em><em>by pushing force:</em>

\tau_{counterclockwise} = F \times d

\tau_{counterclockwise} = 151 \times 3.0

\boxed{\tau_{counterclockwise} = 453 \texttt{ Nm}}

\texttt{ }

<h3>Conclusion:</h3>

\tau_{counterclockwise} > \tau_{clockwise}

\texttt{The teeter-totter rotates \boxed{counterclockwise}}

\texttt{ }

<h3>Learn more</h3>
  • Impacts of Gravity : brainly.com/question/5330244
  • Effect of Earth’s Gravity on Objects : brainly.com/question/8844454
  • The Acceleration Due To Gravity : brainly.com/question/4189441
  • Newton's Law of Motion: brainly.com/question/10431582
  • Example of Newton's Law: brainly.com/question/498822

\texttt{ }

<h3>Answer details</h3>

Grade: High School

Subject: Physics

Chapter: Moment of Force

Alja [10]3 years ago
3 0

Answer:

Counterclockwise

Explanation:

We need to calculate the clocwkise and the counterclockwise torque.

The clockwise torque is the one generated by the child sitting on the right. This torque is given by:

M_C = F d

where

F=mg=(21 kg)(9.8 m/s^2)=205.8 N is the force exerted by the child (his weight)

d = 1.8 m is the distance from the pivot point

So, the clockwise torque is

M_C = (205.8 N)(1.8 m)=370.4 Nm

The counterclockwise torque is the one generated by the adult pushing on the left, and it is given by

M_A = F d

where

F = 151 N is the force applied

d = 3.0 m is the distance from the pivot

Substituting,

M_A = (151 N)(3.0 m)=453 Nm

So, the net torque is

M_A - M_C = 453 Nm - 370.4 Nm=82.6 Nm

And since the counterclockwise momentum is greater than the clockwise one, the teeter-totter will rotate counterclockwise.

You might be interested in
Help greatly appreciated.
alukav5142 [94]

Answer:

If Kepler’s laws define the motion of the planets, Newton’s laws define motion. Thinking on Kepler’s laws, Newton realized that all motion, whether it was the orbit of the Moon around the Earth or an apple falling from a tree, followed the same basic principles. “To the same natural effects,” he wrote, “we must, as far as possible, assign the same causes.” Previous Aristotelian thinking, physicist Stephen Hawking has written, assigned different causes to different types of motion. By unifying all motion, Newton shifted the scientific perspective to a search for large, unifying patterns in nature. Newton outlined his laws in Philosophiae Naturalis Principia Mathematica (“Mathematical Principles of Natural Philosophy,”) published in 1687.

Law I. Every body perseveres in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed theron.

In essence, a moving object won’t change speed or direction, nor will a still object start moving, unless some outside force acts on it. The law is regularly summed up in one word: inertia.

Law II. The alteration of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.

Newton’s second law is most recognizable in its mathematical form, the iconic equation: F=ma. The strength of the force (F) is defined by how much it changes the motion (acceleration, a) of an object with some mass (m).

Law III. To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.

As Newton himself described: “If you press a stone with your finger, the finger is also pressed by the stone.”

Explanation:

Hope this helps I cant say what I wrote is 100% correct so use at your own risk.

6 0
2 years ago
Need Help ASAP!!<br> (Picture)
olchik [2.2K]

Answer:225000000000

Explanation:

5 0
3 years ago
A cabbie is trying to stop when he notices a fare is whistling them over. The
liberstina [14]
  • K.E=18750J
  • Mass=m=2100kg
  • Velocity=v

\boxed{\sf K.E=\dfrac{1}{2}mv^2}

\\ \sf\longmapsto 18750=\dfrac{1}{2}2100v^2

\\ \sf\longmapsto 18750=1050v^2

\\ \sf\longmapsto v^2=\dfrac{18750}{1050}

\\ \sf\longmapsto v^2=17.85m^2

\\ \sf\longmapsto v=\sqrt{17.85}

\\ \sf\longmapsto v=4.1m/s

7 0
3 years ago
The potential energy of a negative charge moved from point A to point B will increase.A negative charge moved from point A to po
AysviL [449]

Answer:

<em>The K.E from A to B won't increase...</em>

Explanation:

That's because the P.E from A to B is increasing. The K.E will increase if charge moves from a higher potential to a lower potential i.e., from B to A.

That is the reason there is no effect on net K.E when moving from a potential to same potential over and over (A to C).

4 0
3 years ago
The earthquake killed about 60 people and was the strongest earthquake to hit
STatiana [176]
This seems like an incomplete question..
3 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the following statements about convection is true? A Convection can only occur during the process of boiling B Convecti
    5·1 answer
  • Process of changing a liquid into a gas
    7·2 answers
  • A slide inclined at 35 takes bathers into a swimming pool. with water sprayed on the slide the bathers spends only one third as
    10·1 answer
  • ____ is rate of change of position.
    6·2 answers
  • In science what is the requirement of doing work?
    12·1 answer
  • A car traveling at 50 km/h hits a bridge abutment. A passenger in the car moves forward a distance of 61 cm (with respect to the
    15·2 answers
  • How does the use of a scanning electron microscope differ from that of a transmission electron microscope?. the options are....
    13·2 answers
  • The smallest unit of a compound is called a ___________.
    5·1 answer
  • Is this true or false the kinetic energy of a freely falling object decreases as it begins to fall
    14·2 answers
  • How does a plane mirror work
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!